1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbfa6fe31c48483415487d2e3f98a6e38c4fadf191a2a49b81e9b588e04a13f7. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d708907-3940-46c9-92b4-4889ab92c73c.json and https://artists.proofprofile.net/proofs/artist/5d708907-3940-46c9-92b4-4889ab92c73c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6bd491346876b6770bf9154fc115d83fe240985e1a12d05cb77e1a33a7d742. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52489044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e24fe8d52e5a22879653238968d1b28078f011b2c7f178f90550f3af978ccea. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52486242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2faa092b76a058bf0fce27ece2cd2425afb2fd300f55082ee4ae8bf3ba5e790. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52409536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120816ec03097fa7b33cbe320937ad7b2ff609baeb1925ec92927436c8beca60. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52409612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37399d277f56822255f54bc5368dedd66892b49914b10d98360e25831730404b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52481523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a527dec4fd6de06491e40a7ea3e367a1c0fb7d3f52b2b2346ca6ac160c289e9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52450378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ecaffb6d6ce21a9cf254be78dfc52f5c19abfb69816e7c52822aa3d2dbb4387. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52450382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c04a91b9c14a1d08f4fe79ac050f9594580d8b3b1dbb4a590f7743d4953924. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52409613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590ab766ed07419769e20b1532fae9c20aed3585f58153a076e6907c56490ddc. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN62423439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcfff205186702dcc7aa1fbf38e5f0dd395a9c43d140eb9adfc4f720c3d7672. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN62423438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e4261c649621585295aa790e1b56e31971f5b74f595a789720ed359e874582. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN62423437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd015e1524a72c6fe2e936da72a607e89ecf24721775caa9927919dbd908b81fa. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52450395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95bb046bb6926606796333b0fd4415f0aa0d72cc7fead07a859e96e7d6d20a7d. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52409609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf258ac123616dbef046626fcfb378ec4604ce188c54a340b8a4111053998044a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6P2404937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd162d835b89bee2a36192f92d224f6e56b3134b6a53d27b208438e6bc370b8e2. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6P2483982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d5c38800ee2ff356c45c94bba2047b5d9a5cf21b0cfdae3a06816ae17f46ff. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWU2499858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecbc0aa2c5359783285091b56829e355bc89c9822166173cc2c3a8cc32ea6ecd. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWU2499859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4496d25666fb112a3ad2f678c3f33df63beef2d38ff40f6a868c3bf64d3b5bea. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA480902173.